Hole filling, charge transfer and superconductivity in Nd1+xBa2−xCu3O7+δ

Kramer, M. J.; Yoo, Sang‐Im; McCallum, R. W.; Yelon, W. B.; Xie, Hui; Allenspach, P.

doi:10.1016/0921-4534(94)90027-2

Cited by 180 publications

(77 citation statements)

References 19 publications

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“…Most of the papers concern the Y-Ba-Cu-O and Nd-Ba-Cu-O systems the latter of which became interesting due to the extended homogeneity region of Nd 1+x Ba 2−x Cu 3 O z (Nd123). The critical temperature T c of the Nd123 solid solution rather sensitively depends on the Nd excess x [1]. The same is true for the Sm123 solid solution [2].…”

Section: Introductionmentioning

confidence: 73%

Phase equilibria and primary crystallisation field for Sm1+yBa2−yCu3O7 at various p(O2)

Wende

Schüpp

Krabbes

2004

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 73%

Phase equilibria and primary crystallisation field for Sm1+yBa2−yCu3O7 at various p(O2)

Wende

Schüpp

Krabbes

2004

Journal of Alloys and Compounds

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“…Extensive XRD, neutron, and EXAFS [34] allow us to conclude that Pr does not substitute for Ba in Pr123 compound. Kramer et al [35] report that Pr@Ba and Nd@Ba have similar influence on the material properties. Therefore, an independent mechanism not active in Nd123 must be present in Pr123 (i.e.…”

Section: Discussionmentioning

confidence: 94%

Ba@Pr or Pr@Ba in R123 HTSC – To be or not to be SC

Akhavan

2004

Physica Status Solidi (b)

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In spite of the vast amount of experimental and theoretical knowledge accumulated in HTSC, the nature of the interaction driving charge carriers to form Cooper pairs below T c is still unknown. To elucidate the controversial insulating/SC Pr123, the substitution of Pr at Ba site (Pr@Ba) with Ba at Pr site (Ba@Pr) in R123 is compared and reviewed. This might shed some light on the microscopic origin of HTSC.

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“…proposed by Kramer et al [20,21], according to which the increase of the Sm content of x results in an increase of the total oxygen content and a decrease in the hole concentration in Cu-O 2 planes by donate electrons of the substitution. Sm 3+ entering Ba 2+ sites leads to a non-fourfold planar coordinated Cu on the chain sites either by the introduction of extra oxygen or oxygen reordering, relocation of oxygen from chain O(1) to the O(5) vacancy site.…”

Section: Resultsmentioning

confidence: 99%